native-update/docs/server-requirements.md

Foundation package for building a comprehensive update system for Capacitor apps. Provides architecture and interfaces but requires backend implementation.

# Backend Server Requirements

This document outlines the server infrastructure you need to build to use this plugin.

## ⚠️ No Server Included

This plugin does **not** include a backend server. You must build your own server that implements these requirements.

## Required API Endpoints

### 1. Version Check Endpoint
```
GET /api/v1/updates/check
```

**Query Parameters:**
- `appId`: Your application ID
- `currentVersion`: Current bundle version
- `platform`: ios | android | web
- `channel`: production | staging | development

**Response:**
```json
{
  "updateAvailable": true,
  "version": "1.2.3",
  "minAppVersion": "2.0.0",
  "releaseNotes": "Bug fixes and improvements",
  "downloadUrl": "https://cdn.example.com/bundles/1.2.3.zip",
  "signature": "base64-encoded-signature",
  "checksum": "sha256-hash",
  "size": 1234567,
  "mandatory": false
}
```

### 2. Bundle Download Endpoint
```
GET /api/v1/bundles/{version}
```

**Requirements:**
- Serve bundle files with proper MIME types
- Support resume/partial downloads
- Include security headers
- CDN integration recommended

### 3. Update Confirmation Endpoint
```
POST /api/v1/updates/confirm
```

**Body:**
```json
{
  "appId": "com.example.app",
  "version": "1.2.3",
  "platform": "ios",
  "success": true,
  "deviceId": "unique-device-id"
}
```

## Security Requirements

### Bundle Signing
- Generate RSA or ECDSA key pairs
- Sign bundles with private key
- Include public key in app
- Verify signatures before applying updates

### HTTPS Requirements
- All endpoints must use HTTPS
- Consider certificate pinning
- Implement rate limiting
- Add authentication tokens

## Storage Infrastructure

### Bundle Storage
- Store bundle files securely
- Implement versioning system
- Clean up old versions
- Monitor storage usage

### CDN Configuration
- Geographic distribution
- Caching strategies
- Bandwidth optimization
- Fallback mechanisms

## Example Server Structure

```
update-server/
├── src/
│   ├── api/
│   │   ├── updates.js
│   │   ├── bundles.js
│   │   └── analytics.js
│   ├── services/
│   │   ├── signing.js
│   │   ├── storage.js
│   │   └── version.js
│   ├── middleware/
│   │   ├── auth.js
│   │   ├── security.js
│   │   └── logging.js
│   └── config/
│       └── index.js
├── bundles/
│   └── [stored bundle files]
├── keys/
│   ├── private.pem
│   └── public.pem
└── package.json
```

## Minimum Implementation Checklist

- [ ] Version check API endpoint
- [ ] Bundle download endpoint
- [ ] Bundle signing implementation
- [ ] HTTPS configuration
- [ ] Basic authentication
- [ ] Error handling
- [ ] Logging system
- [ ] Health check endpoint

## Recommended Features

- [ ] Analytics tracking
- [ ] A/B testing support
- [ ] Rollback capabilities
- [ ] Multi-tenant support
- [ ] Admin dashboard
- [ ] Monitoring/alerting
- [ ] Automated testing

## Getting Help

Since no server is provided, you'll need to:
1. Build your own implementation
2. Use a third-party service
3. Hire developers familiar with update servers

Consider looking at open-source examples or commercial solutions for inspiration.